Gas-fired continuous kiln.



P. SGHWARZ. GAS FIRED CONTINUOUS KILN. APPLICATION FILED 0OT.23, 1911. 4, 3 Patented July 28, 1914,

2 SHEETS-SHEET 1.

faveruzorx THE NORRIS PETERS CQ, PHOTOJJTHQ. WASHINGTON. D. L.

I P. SOHWARZ. GAS FIRED CONTINUOUS KILN.

.QPPLIOATION FILED 00123, 1911.

2 SHEETS-SHEET 2.

Patented July 28, 1914.

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'IHE NOR Is PE new (0 m M 7 W m 9 m 7 m H X 6 My y m 2 a V To all whom it may concern:

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PAUL SCHWARZ, 0F CROOK, ENGLAND.

GAS-FIRED CONTINUOUS KILN.

Be it known that 1, PAUL Sonwnnz, a subject of the King of Great Br tain, residmg at Crook, 1n the county of Durham, England, have invented certain new and useful Improvements 1n Gras- Flred COIltll'lLlOllE' Kilns, and of which the following is a speci fication.

This invention relates exclusively to that definite and known type of gas fired kiln, termed the Hoffmann kiln, and consists in the combination with a pottery kiln of that type, of certain peculiarly constructed and arranged division walls and gas burners, all as hereinafter particularly described and claimed.

The objects of this invention are to improve the operation of the said Hoffmann kiln; especially to compel the gas and ,air and the hot products of combustion to thoroughly mix to an even temperature before reaching the goods, to prevent the playing of pointed flames on the goods, to prevent the access to the goods of streaks of cold air, and toobtain an effective down draft, while at the same time retaining the advantages of the horizontal fire travel and the substantially unobstructed continuous fioor space which have characterized the Holfmann kiln as heretofore constructed and operated.

The following description refers to the ac-. companying drawings, in which,

Figure 1 is a cross section of a kiln of the type mentioned, showing the present invention applied; Fig. 2 is a longitudinal section of a portion of the same kiln, taken at about the line AB, Fig. 1; and Fig. 3 is a horizontal section of the kiln shownat Fig. 1.

Since the present invention consists specifically in a certain combination and arrange,

ment of parts embodied in an improved kiln of the known type termed the Hoflmann, I will first give an outline description of the known Hoifmann kiln with the aid of the accompanying drawings, referring more particularly to Fig. 3, which see. A Hofimann kiln consists of a structure 1 having an endless tunnel, or burning-canal, 2, formed therein, the roof of which is arched transversely of the canal, so as to extend in con tinuous horizontal lines around the kiln, as viewed in Fig. 2, and through the outer wall of the structure there are passageways or wickets 11. communicating with the saidtuna Specification of Letters Patent.

Application filed October 23, 1911.

shown, is placed in front of a space marked 15, and the burning gases and products of Patented July 28,1914.

Serial No. 656,225.

nel or canal 2, which wickets 11 are formed at suitable distances apart and are closable by doors or other devices. The canal 2 can be divided by one division plate so as to grooves; or it maybe inserted at any of the positions indicated bythe dotted lines 13 in Fig.8, but only one such plate 12 is employed. Between every two adjacent grooves through which the plate 12. can he slid to divide the canal 2, there communicates at least one flue, such as the fiues 8, all of which flues 8 communicate with an internal main flue 7 itself communicating with an uptake, which is indicated sufliciently at 14 Fig. 3 by the dotted lines, and it willbe understood that each of the fines 8 is fitted with a damper by which it can be either closed or opened. Usually in this: type of kiln which is gas heated, the gas pipes stand up in rows at suitable distances apart from the floor of the canal, and the latter is filled withthe goods to be burned, except in one of the spaces between the rows of burners. Thus for example the plate 12 at Fig. 3, as

combustion are supposed to be traveling in the direction of the arrows and finding their exit by that flue marked 8*, the "damper of which is of course open, while the other flues 8 are closed. The space 15 is supposed to be empty, while the next space 16 contains finished material having little heat,

and air is at this time entering by the two wickets 11*, 11, the doors of which are open. Thus the air entering, comes into contact with material which gradually increases in temperature, the incoming current of air being drawn by natural draft around the entire canal. The space 15 is then filled with the material to be treated, and the compartment 16 is emptied of the finished material; then the plate 12 is moved to the position shown by the dotted line 17.; the space 16 is then emptied, and so on. It is also to be understood that in, these. known ,kilns thexgas burnerscan be shut off from the gas'supply insections. I In improving. this known type vof kiln according to my invention, I construct v'erti canal as above described; and each pair of these d1v1s1on walls consists of a transverse front wall 9 and a transverse rear wall .10

at a short distance from said front wall 9. The front wall 9 extends from the top of the canal which extends around the kiln in horizontal lines as aforesaid, but itdoes not reach the floor; or'the said wall is provided with openings 9", Figs. 1 and 2, near the base of the canal 2; whilet-he rearwall 10 of each pair does not extend to the roof of the canal and so leaves an opening 10*, Figs. 1 and 2,between its upper edge and "the top of the canal. Between the two walls 9 and .10 of each pair I provide -'a row =of vertical gas burners, 3, in the form of perforated tubes, the gas issuing from the perforations therein, and being supplied by way of subjacent conduits 4, Figs. land 2, from an annular gas canal 5, Fig. il, in communication with any suitable gas producer 6. By providing a Hoiimann kiln as above "described with the saidtransverse walls *9 and 10, and the arrangement of the gas burners 3 between the said walls, practically the whole canal floor space is rendered available for the reception of goods.

In operating a iI-Ioifmann lri'ln having the said transverse walls and gas -'bu rners arranged and constructed according tothi's invention as already described, the ga is shut oil by the usual valves from the burners 3 atthe -rearof=the plate 12, Fig. '3, and also is shut off' from'the gas burne-rs between the compartments and T6 as they may now be termed, and it is through these compart- "ments 1-5 and '16 that the air is admitted by the wickets 11*, 11*, while at the other gas burners the gas for consumption is supplied,

and the burning products pass around "the canal in the direction shown byahe arrows, the roducts of combustion findingtheir exit by, for example, the flue 8".

In the course of its travel, the gaseous heating current will pass beneath the division wall 9 of a pair and over the top of the Wall 10 of the same pair, impinging against the ceiling or roof which "extends continuously in the "direction of said travel in horizontal lines, as shown in Fig. 2, and in passing through the next compartment the gases wil ldescend evenly over the floor area and pass beneath the "division wall 9 of'the next pair,and so through each room part-ment the heating products will have a downward direction as indicated *by the ar rows, for instance at Fig. 2.

By this construction the laying of pointed flames on the goods is avoided, while the arrangement produces an even temperature and no streaks of cold air can get to the.

;goods by reason of the fact that all the air ha to first pass through the hot spaces between the cross walls 9, 10.

Vha't I claim as my invention and desire to secure by patent is 1. The combination with a gas fired pottery kiln of the Hofimann type, as hereinbefore specified, comprising a structure containing an endless 'canal to receive the goods to be treated, the roof of said canal extending continuously in horizontal line around the kiln, said structure having subjacent gas conduits, a number of passageways through the outer wall communicating with said canal, and fines from said canal communieating with an internal main flue and up takeo'f pairs of vertical division walls extending transversely across said canal, each pair of said division wa'lls comprising a front wall and a rear wall at a short distance from said front wall, said front wa'll extending from said horizontal extending roof of said canal but leaving an'opening adjacent to the floor ofsaid canalyand said rear wall extending from the floor of said canal but not reaching the roof thereof so as to leave an opening adjacent to said roof, and a transverse row of upstanding gas burners located within said canal,'be tween the walls composing each pair of said transverse division walls, and in communication with said subjacent gas conduits.

'2. The combination with a gas fired pottery kiln of the Hoffmann type as hereinbefore specified, comprising a structure containing an endless canal to receive the goods to be treated, the roof of said canal being arched transversely of the canal and extending continuously around the kiln; said structure having sub'jacen't gas conduits, a number of passageways through the outer wall communicating with said canal, and fines from said canal communicating with an internal main flue and uptakeof pairs of vertical division walls extending transversely across-said canal to divide said canal into compartments each compartment having one of said passageways through said outer wall of said structure and at least one fiue' communicating with said internal main flue and uptake, each pair of said division wtill's comprising a front wall and 'a rear wall at ashort'distanc'e from said front wall, said front wall'extending from thesaid'continuouslv extending roof of said canal but having through openings adjacent "to the floor ofsaid canal, and said rear wall extending from the floor of said canal but not reaching the roof thereof so as to leave an opening adjacent to said roof, and "transverse rows of upstanding gas burners in the form of perforated tubes within said canal in communication with said subjaoent gas conduits, one of said rows of gas burners being located between the walls compos- 15 pairs of vertical division walls between ing each pair of said transverse division walls.

3. A gas fired pottery kiln having, in combination, a main structure containing an endless canal to receive the goods and provided with passageways for goods and air in its outer wall and with gas conduits and escape flues in communication with said canal the roof of said canal extending continuously in horizontal lines around the kiln and a horizontal floor extending continu ously below said roof, transverse rows of upstanding gas burners in the form of Vertical perforated pipes within said canal, and

which the rows of gas burners are located; the front wall of each pair extending downward from said roof but leaving an open? ing adjacent to said floor, and the rear wall of each pair extending upward from said 20 PAUL SCHWABZ.

Witnesses GEORGE Bowns, Emvns'r BAINBRIDGE.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents.

. Wuhlngton, D. 0. 

